OBO_REL:part_of (UNDECLARED) dermis collagenous dermal stroma A layer of collagen fibrils present in the imature integument in an acellular subepidermal space. At first, the fibrils are all oriented in the same direction, later they form the complex plywood-like structure that is characteristic of the dermal deep region. Le Guellec et al, 2004. TAO:0001186 primary dermal stroma teleost_anatomy